// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
#define CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_

#include "base/callback_forward.h"
#include "content/public/browser/media_request_state.h"
#include "content/public/common/media_stream_request.h"

namespace content {

// An embedder may implement MediaObserver and return it from
// ContentBrowserClient to receive callbacks as media events occur.
class MediaObserver {
public:
    // Called when a audio capture device is plugged in or unplugged.
    virtual void OnAudioCaptureDevicesChanged() = 0;

    // Called when a video capture device is plugged in or unplugged.
    virtual void OnVideoCaptureDevicesChanged() = 0;

    // Called when a media request changes state.
    virtual void OnMediaRequestStateChanged(
        int render_process_id,
        int render_frame_id,
        int page_request_id,
        const GURL& security_origin,
        MediaStreamType stream_type,
        MediaRequestState state)
        = 0;

    // Called when an audio stream is being created.
    virtual void OnCreatingAudioStream(int render_process_id,
        int render_frame_id)
        = 0;

    // Called when the secure display link status of one or more consumers of this
    // media stream has changed.
    virtual void OnSetCapturingLinkSecured(int render_process_id,
        int render_frame_id,
        int page_request_id,
        MediaStreamType stream_type,
        bool is_secure)
        = 0;

protected:
    virtual ~MediaObserver() { }
};

} // namespace content

#endif // CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
